ef31035a ^

ca5a3fcb ^

57628c0e ^

ee9a9237 ^

4224ec81 ^

8188bbbc ^

33352536 ^

7dac9ade ^
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# https://adventofcode.com/2020/day/2
#
# To run (on Linux):
#   $ git clone https://github.com/akkartik/mu
#   $ cd mu
#   $ ./translate advent2020/2b.mu
#   $ ./a.elf < input
#
# You'll need to register to download the 'input' file for yourself.

fn main -> _/ebx: int {
  var valid-password-count/edi: int <- copy 0
  var line-storage: (stream byte 0x100)  # 256 bytes
  var line/edx: (addr stream byte) <- address line-storage
  var slice-storage: slice
  var slice/ecx: (addr slice) <- address slice-storage
  {
    # read line from stdin
    clear-stream line
    read-line-from-real-keyboard line
    # if line is empty (not even a newline), quit
    var done?/eax: boolean <- stream-empty? line
    compare done?, 0/false
    break-if-!=
    print-stream-to-real-screen line
    # slice = next-token(line, '-')
    next-token line, 0x2d, slice
    # pos1 = parse-int(slice)
    var _pos1/eax: int <- parse-decimal-int-from-slice slice
    var pos1/ebx: int <- copy _pos1
    var dash/eax: byte <- read-byte line  # skip '-'
    # slice = next-token(line, ' ')
    next-token line, 0x20, slice
    var _pos2/eax: int <- parse-decimal-int-from-slice slice
    var pos2/esi: int <- copy _pos2
    print-int32-decimal 0, pos1
    print-string 0, " "
    print-int32-decimal 0, pos2
    print-string 0, "\n"
    compare pos1, pos2
    {
      break-if-<=
      print-string 0, "out of order!\n"
      return 1
    }
    # letter = next non-space
    skip-chars-matching-whitespace line
    var letter/eax: byte <- read-byte line
    # skip some stuff
pre { line-height: 125%; }
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# _write: write to a file descriptor (fd)

== code
#   instruction                     effective address                                                   register    displacement    immediate
# . op          subop               mod             rm32          base        index         scale       r32
# . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes

Entry:  # just exit; can't test _write just yet
    bb/copy-to-ebx  0/imm32
    e8/call  syscall_exit/disp32

_write:  # fd: int, s: (addr array byte)
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    50/push-eax
    51/push-ecx
    52/push-edx
    53/push-ebx
    # syscall(write, fd, (data) s+4, (size) *s)
    # . ebx = fd
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           3/r32/ebx   8/disp8         .                 # copy *(ebp+8) to ebx
    # . var data/ecx: (addr byte) = s+4
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           1/r32/ecx   0xc/disp8       .                 # copy *(ebp+12) to ecx
    81          0/subop/add         3/mod/direct    1/rm32/ecx    .           .             .           .           .               4/imm32           # add to ecx
    # . var size/edx: int = *s
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .             .           2/r32/edx   0xc/disp8       .                 # copy *(ebp+12) to edx
    8b/copy                         0/mod/indirect  2/rm32/edx    .           .             .           2/r32/edx   .               .                 # copy *edx to edx
    # . syscall
    e8/call  syscall_write/disp32
    # if (eax < 0) abort
    3d/compare-eax-with  0/imm32
    0f 8c/jump-if-<  $_write:abort/disp32
$_write:end:
    # . restore registers
    5b/pop-to-ebx
    5a/pop-to-edx
    59/pop-to-ecx
    58/pop-to-eax
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

$_write:abort:
    # can't write a message here for risk of an infinite loop, so we'll use a special exit code instead
    # . syscall(exit, 255)
    bb/copy-to-ebx  0xff/imm32
    e8/call  syscall_exit/disp32
    # never gets here

# . . vim:nowrap:textwidth=0